Method of forming a cement-receiving surface on an insulator section



Oct. 8, 1929. w. F. HARVEY 1,731,099

IETHOD 0F FORKING A CEMENT RECEIVING SURFACE 0N AN ISULATR SECTION Filed May Q5, 1926 MA, ATTORNEY ITA-3 Patented (let. 8, `1929 UNITED STATES PATENT omer.

VTILLIAM F. HARVEY, OF LIMA, NEW YORK; MARY HARVEY EXECUTRIX 0F SAID XVILLIAM F. HARVEY, DEGEASED METHOD OF FOR-MING A CEMENT-RECEIVNG SURFAE 0N AN'INSULATOR SECTION Application filed May 3, l

My invention relates to a method of forming a cement receiving surface on one of the sections of an insulator, having reference more particularly to providing a porcelain insulator section of a multipart insulator' with an integral surface of such character as t-o form a tight bend with the cement between the sections, although the surface obtained and the method employed are applicable to other uses as Well. y n

The usual practice heretofore in cementing insulator sections has been to provide one ot' the sections with a cement receiving surface of sand or crushed particles which are affixed to the porcelain body by a glaze or other securing medium, and it is a purpose of my invention to eliminate the necessity of securing sand or like particles to the porcelain body, and to afford a closer bond between the cement and porcelain by a method requiring less time, and which is cheaper to employ than Where sand or crushed particles are secured to the porcelain body. f e

In a more particular aspect, the invention has for its object to provide a porcelain insulator section with an irregularly roughened surface formed by indenting the porcelain While Wet, in a manner to exactly simulate a surface composed of sand or like particles, thereby obtaining a cement receiving` surface directly on the surface of the porcelain and having the same contour and exterior characteristics of a sanded surface.

The invention consists further in producing the desired roughened surface on the porcelain body by means of a tool or die-member Which may have its operative surface coinposed of sand or crushed particles, or may have an operative surface formed by indenting the die-member with a master die of sand or crushed particles, so that it is possible to obtain on the porcelain surface of the insulator section a cement receiving surface which is either an exact duplicate of a surface composed of sand or like particles, or is substantially complemental to such a sanded surface.

Still a further purpose of the invention is to provide a method and means by which a porcelain insulator section can be reughened or indented in less time and at less cost than Serial No. 106,332,

Where a sanded surface is employed, obtaining a surface that has all the advantages of a sanded surface and possesses certain points of superiority thereover.

filth these and other ends in View, the invention consists in the structure and procedure that will appear from the following description when read in conjunction with the accompanying drawing, the novel characteristics being' pointed out in the claims following the description.

In the drawing:

Figure l is a sectional view of one type of insulator made in accordance With the invention;

Figure Q is a side elevation of the inner section of the insulator, showing the relative position of the tool or die-member in applying the cement receiving surface to the insulator section;

Figure 3 is a side elevation of the tool;

Figure 4t is a sectional view of a modified form of tool;

Figure 5 is an enlarged sectional vieu7 of a portion of an insulator section, showing the indentations forming the cement receiving surface when made by a positive die member, and

Figure 6 is a similar view showing a cement receiving surface when produced by a negative die-member.

The invention is applicable to various products Where a reughened surface is desirable, and may be practiced in many different Ways other than What is set forth herein. rllhis application' is not intended to limit the invention in construction, form of procedure, or adaptation, but is merely to set forth a practical embodiment that is exemplary of itspractical field of use.

Figure l illustrates a known type of tWopart insulator to which the invention can be applied, and which comprises an inner seetion l and an outer section 2, held together by a body of cement 3 between them.

The general procedure in'cementing this type of insulator heretofore has been to pro-v vide on the inner section l a cement receiving surface of sand or crushed particles that are attached to the surface of the porcelain Cil body by means of a glaze or the like, such sanded surface being aliixed to the porcelain body before the cement is inserted between the sections. According to my invention, no sand or crushed particles need be secured to the surface of the porcelain body, and the same effect is obtained by providing the cement receiving surface of the porcelain body with an irregularly roughened or indented area that simulates and has the same exterior characteristics as a sanded surface.

T his result is accomplished by using a tool or die-member, as illustrated at e, and applying it to the desired surface of the porcelain section While the latter is in a 'wet state, and before baking. rlhe tool or die-member may comprise a cylindrical roller as shoivn, mounted on a suitable handle 5, so that it can readily be held in operative relationship to the porcelain, prefera1 ly by mounting the insulator section on a s .itable support that is rotated While the toolis maintained against the surface. Or the tool may taliethe form of a. ring, band or stamping device, or other character adapted for repreducing` its opera tive surface on the porcelain body.

The tool'or die-member e, as shown in Figures 2 and 3, includes a body p rtiou to the periphery of Which are attached a multiplicity7 l of sand or crushed part eres, by gluing or otherwise, to afford an irregular, sand-like surface that is pressed against the p rcelain bot y of the insulator. lllhere a sanded surface is used on trie tool or die-member, as

'shown in Figure 2, the irregularly roughened Vor indented cement receiving surface on the insulator section is coinplemental to the sand or crushed particles on the die-member.

ln order to reduce the cost of operation, the cylindrical portion of the tool or die-member may be made of porcelain, as shown in Figure e, in which case its operative surface 6 is formed, While the porcelain is Wet, by rolling thereagainst a master die having an operative surface composed of sand or crushed particles. r'hus one master die can be used to make a large number of porcelain tools such as shown in Figure Ll. lllhen thus formed, the surface 6 on the tool is complemental to the master surface of sand or crushed particles. lfhen this complemental or negative tool or diemember, illustrated in Figure el, is rotated against the porcelain body of the insulator section, the indentations or roughened surface formed thereon becomes positive, and is a substantial duplicate of the surface composed of sand or crushed particles.

Figure 5 illustrates cement receiving surface on the insulator section made by a positive tool or die-member, as Where sand or crushed particles constitute the operative surface of the tool, the indented surface being negative, or complemental to the positive tool, whereas Figure 6 shoivs a coment receiving surface that is positive, or complementai to a negative tool, such as illustrated in Figure il. ln either case, the surface produced forms a perfect bond or union With the cement that is more efficient and Will stand greater strains than `Where sand or crushed particles are attached to the porcelain insulator section to obtain a roughened surface. The carrying out of the invention described involves a subsi ntial reduction in cost because the required tools can be made cheaply, and it re Quiros only a second or two to bring the tool and insulator section into operative relation and completel7 indent the surface in the porcelaiu.

'l' he tool or die-member and the method of procedure described may be modified, and this application is intended to cover any changes or departures that accomplish the same result and come Within the intent of the invention or the scope ofthe following claims.

l claim:

l. ylhe me Vhod of forming a cement rej surface on an insulator section which Ls of roughening the porcelain surface lai-ly While Wet.

2. The method of forming a cement receivsurface on an insulator section which cons in subjecting the porcelain surface While i t to the dent-ing action of a multiplicity of sand-like particles.

S3. rEhe method of forming a cement receiviir surface on an insulator section which conin subjecting the porcelain surface While wet to the indenting action of an irregular surface haring the characteristics of sandlilie particles.

in Witness whereof, l have hereunto signed my name.

lVlLlJL/XM F. HAR TEY. 

